(57) A reproduction device forms a two-color copy in a single-pass mode. An original document
(30), bearing fluorescent material on selected portions thereof, is illuminated by
a light source (39). The light reflected from the document is transmitted through
an colored filter (45) and is projected onto the surface of a monopolar photoreceptor
(12). Light incident on the fluorescent material is absorbed over a specific wavelength
range and is re-emitted at a different wavelength range. This light, and light reflected
from the white background, are transmitted through the filter of a color associated
with the re-emitted radiation. Light reaching the photoreceptor discharges charged
areas thereon at two energy levels. The resulting latent image incorporates three
separate discharge levels, corresponding to the dark image information, colored fluorescent
areas, and background areas. The dark and colored areas are developed with appropriate
colored toner by developer units (55, 56) biased at the appropriate levels.
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